1. You have to have Android 2.2 already installed.
2. Download the Team Chaos Clean Black Theme to the root of your SD Card.
3. Open ROM Manager and choose “Install ROM from SD Card.”
4. Choose the “Team_CHAOS_Clean_black_froyov1.2.zip”.
5. No need to “wipe data and cache,” but you should probably make a backup.
6. Allow your phone to boot into recovery and work its magic.
7. It will reboot, and BAM! Done!